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Chiral Imprint of a Cosmic Gauge Field on Primordial Gravitational Waves · Around

2014

Chiral Imprint of a Cosmic Gauge Field on Primordial Gravitational Waves

Bielefeld, Jannis, Caldwell, Robert R.

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A cosmological gauge field with isotropic stress-energy introduces parity violation into the behavior of gravitational waves.

We show that a primordial spectrum of inflationary gravitational waves develops a preferred handedness, left- or right-circularly polarized, depending on the abundance and coupling of the gauge field during the radiation era.
A modest abundance of the gauge field would induce parity-violating correlations of the cosmic microwave background temperature and polarization patterns that could be detected by current and future experiments.

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J. Bielefeld and R. R. Caldwell, in preparation

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J. Kaufman, B. Keating and B. Johnson, arXiv:1409.8242 [astro-ph.CO]

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